diff --git a/configs/configupgrade/test-fixtures/valid/number-literals/input/number-literals.tf b/configs/configupgrade/test-fixtures/valid/number-literals/input/number-literals.tf
new file mode 100644
index 0000000000..efae79c65a
--- /dev/null
+++ b/configs/configupgrade/test-fixtures/valid/number-literals/input/number-literals.tf
@@ -0,0 +1,7 @@
+locals {
+  decimal_int          = 1
+  decimal_float        = 1.5
+  decimal_float_tricky = 0.1
+  hex_int              = 0xff
+  octal_int            = 0777
+}
diff --git a/configs/configupgrade/test-fixtures/valid/number-literals/want/number-literals.tf b/configs/configupgrade/test-fixtures/valid/number-literals/want/number-literals.tf
new file mode 100644
index 0000000000..19e7376aba
--- /dev/null
+++ b/configs/configupgrade/test-fixtures/valid/number-literals/want/number-literals.tf
@@ -0,0 +1,7 @@
+locals {
+  decimal_int          = 1
+  decimal_float        = 1.5
+  decimal_float_tricky = 0.1
+  hex_int              = 255
+  octal_int            = 511
+}
diff --git a/configs/configupgrade/test-fixtures/valid/number-literals/want/versions.tf b/configs/configupgrade/test-fixtures/valid/number-literals/want/versions.tf
new file mode 100644
index 0000000000..d9b6f790b9
--- /dev/null
+++ b/configs/configupgrade/test-fixtures/valid/number-literals/want/versions.tf
@@ -0,0 +1,3 @@
+terraform {
+  required_version = ">= 0.12"
+}
diff --git a/configs/configupgrade/upgrade_expr.go b/configs/configupgrade/upgrade_expr.go
index d568e8db61..2f525a3b1d 100644
--- a/configs/configupgrade/upgrade_expr.go
+++ b/configs/configupgrade/upgrade_expr.go
@@ -143,8 +143,17 @@ Value:
 				buf.WriteString("false")
 			}
 
+		case hcl1token.NUMBER:
+			num := tv.Value()
+			buf.WriteString(strconv.FormatInt(num.(int64), 10))
+
+		case hcl1token.FLOAT:
+			num := tv.Value()
+			buf.WriteString(strconv.FormatFloat(num.(float64), 'f', -1, 64))
+
 		default:
-			// For everything else (NUMBER, FLOAT) we'll just pass through the given bytes verbatim.
+			// For everything else we'll just pass through the given bytes verbatim,
+			// but we should't get here because the above is intended to be exhaustive.
 			buf.WriteString(tv.Text)
 
 		}